By Jingde Gao

"AC computer platforms" stresses either research tools and working performances of AC desktop platforms, together with variable pace force method of AC machines with energy electronics and keep watch over units, energy strength process composed of AC machines and tool traces, targeted computer approach with targeted machines and targeted a lot, electrical desktop procedure inclusive of AC machines and excitation units. in line with a unmarried coil, the Multi-Loop concept is punctiliously defined, and examples of the way to exploit the recent strategy are awarded. This ebook offers a brand new means for studying the AC desktop platforms. This e-book is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. it is also a reference booklet for comparable technicians.

This e-book is written in reminiscence of Professor Jingde Gao, past-president of Tsinghua collage, Member of chinese language Academy of Sciences. one other authors, Linzheng Zhang and Xiangheng Wang either are Professors in electric Engineering Dept. of Tsinghua University.

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**Example text**

B. The serial number of stator and rotor loops is along reverse rotation direction. If the stator phase winding consists of 2P series coil groups, there are q coils in each coil group, and the first coil under the first pole is taken as the initial coil, then the total serial number of n - th coil under m -th pole is (m 1)2q n . 15) When k is odd 2P ¦ (1) m 1 cos k[J c (m 1)S nT jM ] 2 P cos k (J c nT jM ) m 1 When k is fraction or even, the value of the above formula is zero.

5 Model for calculating inductances of salient pole synchronous machine 26 1 Circuit Analysis of AC Machines — Multi-Loop Model and Parameters nE S 2 wr i sin 1 , wr is the turn number of the damping loop (normally 2P nS wr 1 ), E1 is short pitch ratio of the damping loop; x1 is the abscissa on the rotor, its origin is located on the axis of damping loop 11c . 4) contains only cosine items owing to the symmetry of rectangular wave mmf to the axis of damping loop. 10) In the above formula, | k j | and | k j | are obtained in such a way: In formula (1-5-8), when j k r 2l , j k r2l , so there is 2l | k j | ; when j k 2l (since k and 2l are positive, j cannot equal k 2l ), then 2l | k j | .

9) 1 2 3 , , ,"; M nmincaj represents the mutual inductance between i -th P P P coil under n -th pole of winding m and j -th coil under nc - th pole of winding a . When k is odd in which k 2P ¦ (1) n nc cos k[(n nc)S (i j )T qT ] nc 1 2 P cos[k (i j )T kqT ] When k is fraction or even, the above formula is zero. 10) in which k 1,3," ; wm and wa are the series turn number per phase of the main phase winding and auxiliary phase winding, respectively; kqT is the electric angle between k -th harmonic central lines of the main phase and auxiliary phase windings.